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The evolution of computer started from 16th century and resulted in the form that we see today. The present day computer, however, has also undergone rapid change during the last 50 years. Generations in computers means a change or improvement in the technology over a period of time.

First Generation ( 1940-1956 ):These computers are designed based on the vacuum tube technology. The computers were large, slow and accurate with high power requirement and large amount of heat generated.Ex: ENIAC - (Electronic Numerical Integrator And Calculator)

Second Generation( 1956-1963 ):These computers used transistors which were a smaller and more reliable devices then vacuum tubes.second generation computers used high level languages, such as COBOL, FORTRAN etc.Operating systems also developed in this period.Ex: IBM 1401

Third Generation (1964-1971):These computers used integrated circuit ( I.C's) These were much efficient than the earlier ones.These computers were highly reliable, cheaper and faster than the second generation computers. 3rd generation computers used Small Scale Integrated circuits(SCIC) and Medium Scale Inegrated Circuits (MSIC).Ex: IBM 360

Fifth Generation (Present and Beyond):Fifth generation computers as aimed specifically at A.I.M (Artificial Intelligence Technology). The speed is externally high in 5th generation computer. The concept of Artificial intelligence has been introduce to allow the computer to take own decision. Fifth generation computers are still in development stage.

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